Which of the following is paramagnetic?

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(A) . Elements or ions containing unpaired electrons are paramagnetic.$_{28}Ni = [Ar] \; 3d^8 4s^2$; $Ni^{2+} = [Ar] \; 3d^8 4s^0$.In $Ni^{2+}$,the $3

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$Ni^{2+}$

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(A) . Elements or ions containing unpaired electrons are paramagnetic.$_{28}Ni = [Ar] \; 3d^8 4s^2$; $Ni^{2+} = [Ar] \; 3d^8 4s^0$.In $Ni^{2+}$,the $3d$ subshell has $8$ electrons,which means there are $2$ unpaired electrons.$_{29}Cu^+ = [Ar] \; 3d^{10} 4s^0$ (diamagnetic).$_{30}Zn^{2+} = [Ar] \; 3d^{10} 4s^0$ (diamagnetic).$_{21}Sc^{3+} = [Ar] \; 3d^0 4s^0$ (diamagnetic).Since $Ni^{2+}$ has unpaired electrons,it is paramagnetic.

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